Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop

Performance

Accessibility

Best Practices

100

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

2.53 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

3.32 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

1 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.007

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

2.61 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

5.08 s

Page Load Progression

375 ms

750 ms

1.1 s

1.5 s

1.9 s

2.2 s

2.6 s

3.0 s

Checks

5 PASS 3 REVIEW 5 FIX

Page Weight Budget

Action

3.3 MB transferred, 247 requests

FIX

3.3 MB transferred, 247 requests

Page weighs 7.7 MB (3.3 MB transferred)

JavaScript is 1.6 MB — consider code splitting or lazy loading

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Got: 1.6 MB

Images are 1.1 MB — compress or use modern formats

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Got: 1.1 MB

Fonts are 284 KB — consider subsetting or using system fonts

Subset fonts to include only used characters, or switch to system font stacks.

Got: 284 KB

CSS is 223 KB — consider purging unused styles

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Got: 223 KB

247 HTTP requests — consider bundling or reducing

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Estimated 0.68 g CO2 per page load

3.3 MB transferred

247 requests

0.68 g CO2 per page load

JavaScript 1.6 MiB 49%

Images 1.1 MiB 32%

Fonts 283.6 KiB 9%

CSS 222.7 KiB 7%

HTML 56.4 KiB 2%

Other 43.6 KiB 1%

Other 14.7 KiB 0%

Other 2.7 KiB 0%

Other 669 B 0%

Other 137 B 0%

Other 0 B 0%

0 2.4 MB 4.9 MB

Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

Third-Party Impact

Action

100% third-party, 0 ms blocking

FIX

100% third-party, 0 ms blocking

Third-party code accounts for 100% of page weight (3.3 MiB of 3.3 MiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

JS Bundles

Action

63 scripts, 499 KB unused

FIX

63 scripts, 499 KB unused

https://www.google.com/cse/static/element/dc329f57...: 70 KB unused (68%)

Consider code splitting or tree shaking to reduce unused code.

https://www.googletagmanager.com/gtag/js?id=G-S5RE...: 66 KB unused (38%)

Consider code splitting or tree shaking to reduce unused code.

https://www.googletagmanager.com/gtm.js?id=GTM-W48...: 65 KB unused (34%)

Consider code splitting or tree shaking to reduce unused code.

https://www.googletagmanager.com/gtag/js?id=AW-113...: 64 KB unused (45%)

Consider code splitting or tree shaking to reduce unused code.

https://www.googletagmanager.com/gtag/js?id=AW-101...: 61 KB unused (42%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 499 KB

499 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.google.com/cse/static/element/dc329f57de078f5d/cse_element__en.js?usqp=CAM%3D	103 KB	70 KB (68%)	✓	3rd
https://www.googletagmanager.com/gtag/js?id=G-S5RECKWMRS&l=beehiveDataLayer	175 KB	66 KB (38%)	✓	3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W48BR57	190 KB	65 KB (34%)	✓	3rd
https://www.googletagmanager.com/gtag/js?id=AW-11371885090&cx=c&gtm=4e64m0h2	144 KB	64 KB (45%)	✓	3rd
https://www.googletagmanager.com/gtag/js?id=AW-1010127458	144 KB	61 KB (42%)	✓	3rd
https://www.googletagmanager.com/gtag/js?id=AW-11425704145	146 KB	60 KB (42%)	✓	3rd
https://www.googletagmanager.com/gtag/js?id=DC-13720113&cx=c&gtm=4e64m0h2	130 KB	58 KB (45%)	✓	3rd
https://connect.facebook.net/en_US/fbevents.js	97 KB	31 KB (33%)	✓	3rd
https://www.utdallas.edu/wp-includes/js/jquery/jquery.min.js?ver=3.7.1	35 KB	23 KB (66%)	✓	3rd
https://www.utdallas.edu/wp-content/plugins/utd-shared-core/assets/build/js/scripts.js?ver=1.1.0	1 KB	—	✓	3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Page Weight Inventory

Action

247 resources · 3.3 MB · 499 KB savings available

FIX

247 resources · 3.3 MB · 499 KB savings available

Page weight 2.3 MB over 1MB target

Got: 3.3 MB Expected: ≤ 1 MB

~499 KB of savings available

245 third-party resources (100% of weight)

2 resources over 200KB

247 resources · 3.3 MiB · 245 third-party 2.3 MiB over 1MB target

JavaScript 49% · 1.6 MiB

Image 33% · 1.1 MiB

Font 9% · 283.6 KiB

CSS 7% · 222.7 KiB

Document 2% · 72.0 KiB

Other 1% · 19.6 KiB

~498.6 KiB of savings available

Remove unused JavaScript: 498.6 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

247 resources			3.3 MiB

HTTP Caching

Action

No cache headers

FIX

No cache headers

No Cache-Control header found

Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

Image Optimization

55 images, 0 KB saveable

REVIEW

55 images, 0 KB saveable

All images are well-optimized

55 images 1.1 MB

0 oversized -0 KB

53 legacy format

0 missing dimensions CLS risk

JS Execution Cost

752ms total JS execution

REVIEW

752ms total JS execution

Unattributable: 219ms CPU time

https://www.utdallas.edu/: 167ms CPU time

https://www.googletagmanager.com/gtm.js?id=GTM-W48...: 118ms CPU time

https://www.googletagmanager.com/gtag/js?id=AW-114...: 73ms CPU time

https://www.googletagmanager.com/gtag/js?id=G-S5RE...: 70ms CPU time

Third-party scripts: 752ms (100% of total)

Main Thread Breakdown

Script Evaluation 51% Other 21% Script Parsing & Compilation 12% Style & Layout 9% Parse HTML & CSS 4%

Script	Total	Scripting	Parse/Compile	Party
Unattributable	219ms	12ms	0ms	3rd
https://www.utdallas.edu/	167ms	6ms	6ms	3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W48BR57	118ms	98ms	13ms	3rd
https://www.googletagmanager.com/gtag/js?id=AW-11425704145	73ms	64ms	9ms	3rd
https://www.googletagmanager.com/gtag/js?id=G-S5RECKWMRS&l=beehiveDataLayer	70ms	58ms	11ms	3rd
https://connect.facebook.net/en_US/fbevents.js	53ms	25ms	27ms	3rd
https://www.googletagmanager.com/gtag/js?id=AW-11371885090&cx=c&gtm=4e64m0h2	53ms	40ms	13ms	3rd

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

12 fonts (284 KB)

PASS

12 fonts (284 KB)

12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

284 KB total

Render-blocking

of 12

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

academicons.woff2 unknown swap

Size 28 KB

Load time 437 ms

Start 536 ms